Applies f if this is a failure or s if this is a successful value.
Applies f if this is a failure or s if this is a successful value.
the function to apply on failure
the function to apply on successful A value
the results of applying appropriate function
Returns successful value, or throws exception.
(Since version 2.3.0) Use filter on toEither.right.
(Since version 2.3.0) Use directly toEither
(Since version 2.3.6) For internal use, will be made private